Abstract
Abstract Xue-Ren Hong et al. [EPL, 139 (2022) 14001] Details of the electron dynamics and Thomson backscattering of electrons moving in a combined field of a tightly focused Gaussian laser pulse and an external uniform magnetic field are investigated. It is found that electrons can be pushed out from the laser pulse by a qualitative dynamic, leading to the phenomenon that the symmetry of the electron dynamics from the Gaussian envelope is broken. In this comment, we investigate the motion law of electrons under precise laser pulses, and we find that the longitudinal vector potential of electrons has a non-negligible effect on the electron motion, especially when the laser peak amplitude is enhanced, the laser pulse width becomes wider, the beam waist of the laser pulse becomes tighter. In addition, we explain the reason for such a large effect of the longitudinal vector potential from the point of view of electron dynamics.
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